This book is the second in a trilogy of books describing David's insights and experiences with the non-physical dimensions of the Earth. Subtle Worlds: An Explorer's Field Notes provides an overview of these non-physical dimensions. The third book will be about how to safely engage and work with subtle beings. This book covers the middle ground. It is neither an overview nor is it about subtle beings themselves. It is about subtle energies, qualities and forces that fill the non-physical world the way sunlight fills the physical air around us. It is about energy hygiene, methods and techniques for working with these non-physical forces.